AN21: Instructions for Use of Nickel-Cadmium Battery Packs

Discussion

Note: As of January 2011, Sea-Bird does not manufacture the 90226 Ni-Cad battery charger, because parts are no longer available. We are still able to provide the battery pack, for customers who already have a charger.

Nickel-Cadmium (Ni-Cad) battery packs are shipped uncharged. Follow this procedure to charge and install a battery pack, and to set up the instrument to run with Ni-Cad batteries:

To charge the pack, follow the instructions in Application Note 43, which came with the Sea-Bird Universal Battery Charger. The batteries should charge for 15 hours (overcharging will not damage the batteries).

Disconnect the battery pack from the charger and the charger from the power source. Check the voltage at BAT+ and BAT- on the battery cover. It should be approximately 10.8 volts for a 9-cell pack or 14.4 volts for a 12-cell pack.

The posts inside the housing are not placed symmetrically, so the battery pack fits into the housing only when aligned correctly. Looking at the battery bottom cover, note that one circular cutout is closer to the edge than the others, corresponding to the post that is closest to the housing.

Some older Sea-Bird instruments have PVC plastic chocks (spacers) used to position and reinforce the posts when the instrument is used with loose alkaline batteries. Cut away the silicon rubber securing these chocks and remove them before installing the Ni-Cad pack.

While pressing the pack firmly into the battery compartment to compress the springs, secure the pack in place with 3 Phillips-head screws and washers. The screws must be fully tightened, with the washers beneath the screw heads, or battery power to the circuitry will be intermittent.

Update the battery type setting for the instrument:

SBE 17plus V2 Searam — Run SeatermAF. In the Configure menu, select SBE 17plus V2. In the dialog box, on the 17plus Communications tab, select Ni-Cad batteries and click OK or Save As. On SeatermAF's Toolbar, click Program to program the updated configuration into the instrument.

SBE 19plus SeaCAT CTD — Run Seaterm and connect to the CTD.
- (19plus firmware version < 1.5) Send the BatteryType=1 command to set up for Ni-Cad batteries.
- (19plus firmware version 1.5 and later) Send the BatteryType=nicad command to set up for Ni-Cad batteries.